System of electrical distribution.



No. 659,828. Patented Oct. l6, I900. E. w. RICE, In.

SYSTEM OF ELECTRICAL DISTRIBUTION.

(Application filed Aug. 16, 1899.)

(No Model.)

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UNITED STATES- EDIVIN IV. RICE, JR, OF SOI-IENECTADY, NEIV YORK,ASSIGNOR TO THE PATENT OFFICE.

GENERAL ELECTRIC COMPANY, OF NEIV YORK.

SYSTEM OF ELECTRICAL DISTRIBUTION.

SPECIFICATION forming part of Letters Patent No. 659,828, dated October16, 1

Application filed August 16, 1899. Serial No. 727,348- (No model.)

To all whom it may concern.-

Be it known that I, EDWIN W. RICE, Jr., a citizen of the United States,residing at Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Systems of ElectricalDis tribution, (Case No. 1,038,) of which the fol lowing is aspecification.

My present invention relates to means for transforming multiphasealternating current into direct current in such manner and by theemployment of such apparatus as will permit the direct current producedto be utilized for feeding three-wire orother multipleconductordirect-current systems.

My invention will be better understood by reference to thefollowingdescription, taken in connection with the accompanyingdrawing,whi1e its scope will be particularly pointed out in the appendedclaims.

In the drawing, G is intended to indicate any suitable source ofmultiphase current, and in this instance four collector-rings are shownas representing a source of two-phase current. The transmission-linesconnected thereto consist in the present instance of two independentcircuits formed of conductors l 1 and conductors 2 2. The conductors 1 1serve to convey an alternating current of one phase, while theconductors 2 2 carry alternating current of another phase, the currentsbeing angularly displaced from each other by approximately ninetydegrees. In practice I find it preferable to maintain the two circuitscarrying current of different phase independent of each other; but thisis not requisite, since, if desired, two of; the conductors may beconsolidated, so as to form a single returnconductor in a manner wellunderstood in the art. The dotted lines 3 4. indicate this alternativeconstruction and are shown as connecting together two of the conductorsl 2.

Transformers T T are used for securing suitable impressed electromotiveforces for the rotary converters O 0 These transformers are shown as ofthe single-phase type, the primary P of one transformer being suppliedfrom the lines 1 1, while the primaryP of the other transformer issupplied from the lines 2 2. The secondaries S S of the transformers areindependent of each otherand are individually connected to thesingle-phase rotary converters 0 C the direct-current terminals of whichare arranged in series and connected to a three-wire direct-currentsystem. The converter 0 is fed from the secondary S, while its companionconverter is fed from the secondary S The conductor 6, which forms theneutral of the direct-current three-wi re system, is connected to thecommon connection 8 between the directcurrent terminals of theconverters, while the outside conductors 5 7 of the three-wire systemare connected to the remaining direct-current terminals of theconverters. Suitable translating devices, such as lamps L or a motor M,are fed from the mains of the three-wire system, as shown. With thisarrangement all the advantages of the three-wire system of distributionare obtained in connection with a transmission-line in which the poweris conveyed through the medium of alternating currents.

Although I have shown the transformers T T as of the single-phase type,it will be evident that other means for transformation may beemployedsuch, for example, as a two-phase transformer with a commonreturn magnetic circuitor, if desired, the transformers may be entirelyomitted and the converters fed directly from the transmissionline.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

l. The combination of a multiphase source of supply, single-phase rotaryconverters fed from different phases of said source, and direct-currentmains fed by said rotary converters.

2. The combination of a multiphase source of supply, single-phase rotaryconverters differently connected to said source, and a multipleconductor, direct-current system fed by said rotary converters.

3. The combination of a multiphase source of supply, single-phase rotaryconverters fed one from one phase and another from another phase of saidsource, and a multiple-conductor direct-current system fed by saidrotary converters.

4. The combination with a source of multiphase current, single-phaserotary converters fed one from one phase and another from another phaseof said source, and a directcurrent system fed jointly by said rotaryconverters.

5. The combination with the conductors of a multiphase system, of aplurality of secondary coils supplied with energy transmitted over saidconductors, and a plurality of rotary converters one of which issupplied with energy solely from one of said secondary coils.

6. The combination with a multiphase system, of a plurality ofindependent secondary coils supplied with energy from said system, and aplurality of rotary converters each fed solely from one of saidsecondary coils.

'7. The combination of a quarter-phase system of distribution and rotaryconverters fed one from one of the sides of said system and another fromanother side of said system.

8. The combination of a quarter-phase system of distribution, rotaryconverters fed one from one side of said system and another from anotherside of said system and a multiple-wire direct-current system fed bysaid converters.

9. The combination of a multiphase system of distribution, rotaryconverters each fed from one of the sides of said system, and amultiple-wire direct-current system fed by said converters.

10. The combination of a multiphase sys tem, and means for separatelytransforming into direct current the current derived from each side ofsaid system.

11. The combination of a plurality of rotary converters, a multiphasedistribution system, and means for supplying one rotary converter withcurrent derived from said system and of a phase different from thatsupplied 10 another rotary converter.

In Witness whereof I have hereunto set my hand this 14th day of August,1899.

I EDWIN W RICE, JR. Witnesses:

BENJAMIN B. HULL,

MABEL E. JACOBSON.

